If none of the checkboxes (see the screenshot below) have been set, an e-mail is always sent at the corresponding interval, even if there have been no changes.
Then the e-mail contains the following note:
There have been no status changes to bookmarked products in the bookmarking list [name of bm list] during the configured email alert interval.
If checkboxes are set, an e-mail is only sent if one of the trigger events has occurred.
Exceptions:
As described above, a mail is sent when a list is created. If none of the trigger events occurred on the creation date of the list, the list is empty.
The same applies if a new GGN is added to the list and none of the trigger events have occurred for the new GGN on the date.
